SplDoublyLinkedList::isEmpty()
(PHP 5 >= 5.3.0, PHP 7)
Checks whether the doubly linked list is empty
说明
public SplDoublyLinkedList::isEmpty(void) : bool
参数
此函数没有参数。
返回值
Returns whether the doubly linked list is empty.
//isEmpty is a method of SplDoublyLinkedList $obj = new SplDoublyLinkedList(); // Check wither linked list is empty if ($obj->isEmpty()) { $obj->push(2); $obj->unshift(10); } print_r($obj); //Output like this SplDoublyLinkedList Object ( [flags:SplDoublyLinkedList:private] => 0 [dllist:SplDoublyLinkedList:private] => Array ( [0] => 10 [1] => 2 ) )